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config/filters/dates.js

@@ -0,0 +1,5 @@
+module.exports = function(eleventyConfig) {
+    eleventyConfig.addFilter('dateDisplay', date => new Date(date).toLocaleDateString('en-GB', {
+        "dateStyle": "short"
+    }));
+}

config/filters/index.js

@@ -1 +1,5 @@
-module.exports = function() {}
+const dateFilters = require('./dates');
+
+module.exports = function(eleventyConfig) {
+    eleventyConfig.addPlugin(dateFilters);
+}